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Dynamical polygonization below the cellular-bifurcation threshold in thin-sample directional solidification
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DOI：10.1103/PhysRevB.66.054102.png)
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We show that a polygonization of the crystal (formation of grain subboundaries) takes place during the growth in thin-sample directional solidification of a transparent nonfaceted alloy at solidification rates lower than the cellular-bifurcation threshold. We give experimental evidence that this phenomenon is due to a dynamical coupling between the lattice defects intersecting the growth front and the diffusive modes of instability of the front. We present a theoretical model of this process in two-dimensional systems.
Keyword:
LAMELLAR EUTECTIC GROWTH
STABILITY ANALYSIS
ALLOY
INSTABILITIES
PATTERNS
FRONT
CU
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期刊
IF:
3.7
论文数:
15.4W
被引数:
41.0W
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